Bone plug



FIG. 1 is a side elevation of a bone plug showing my new design;

FIG. 2 is a side elevation of the side opposite that shown in FIG. 1;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and,

FIG. 5 is a bottom perspective view thereof. 

I claim the ornamental design for a bone plug, as shown and described. 